Steam-generating appliance.



No. 63|,322. Patented Aug. 29, |899.

v E. L. m99.

STEAM GENEBATING APPLIANCE.

(Applibaeion med oct. 1s, 199s.)

UNITED STATES PATENT OFFICE..

EDWARD L. Rice, oF eEI'swoLD, IowA.

STEAM-GENERATING APPLIANCE.

SPECIFICATION forming part of Letters Patent No. 631,822, dated August 29, 1899.

Application filed October 18, 1898.` Serial No. 693,881. (No model.)

To a/ZZ whom it may concern:

Be it known that I, EDWARD L. RIGG, acitizen of the United States of America, residing at the town of Griswold, in the county of Cass and State of Iowa, have invented certain new and useful Improvements in Steam-'Generating Appliances; and I do declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to the letters of reference marked thereon, which form a part of this specification.

My invention relates to those hollow-grate steam-generating appliances having hollow water-conductors in the fire-box connected to the grate and which are provided with a pump for drawing the water from the boiler and forcing it through the grate and waterconductors connected thereto back into the boiler, and which accelerates the generation of steam and at the same time produces a circulation of water through the grate, waterconductors, and boilerg'and my object is to provide means which will more perfectly accomplish such purposes.

To this end my invention consists in the` employment of hollowr grate-bars of peculiar construction having hollow water-conductors in the reibox connected thereto in combination with certain cooperating mechanism, allY of which will be more fully described hereinafter and pointed out in the claims.

Referring to the accompanying drawings, Figure l represents a perspective view of an upright boiler and furnace having my improvements applied, a portion of the casing of the furnace being cut away to show the grate and water-conductors therein. Fig. 2 is a detailed top plan view of the rear end piece of the grate, and Fig. 3 is a similar view of the front end piece of the grate.

Similar letters refer to similar parts throughout the several views.

A is an upright boiler of ordinary construction.

The boiler A has arranged below it the furnace F, which may be constructed of a cylindrical form, as shown in the drawings, or of any other preferred form.

D is the Afire-box of the furnace, and P is thegrate, which is arranged therein, so that when the fire is built a draft-space will be left below. The grate P is composed of the hollow end pieces n and' b and the hollow looped grate-bars c, the open front ends of which enter the front end piece n, and the rear open ends of the same enter the rear end piece b. One or more of these looped grate-bars can be employed; but if the fire-box is large several should be used.

ca are hollow looped water-conductors located in the fire-box a few inches above the grate, the open front ends of which bend downward and enter the front end piece n, and the rear open ends of which bend downward and enter the rear end piece ZJ. One or more o f these hollow looped conductors can be employed; but if the fire-box is large several should be used. When the hre-box is cylindrical in form, the pieces n and b are constructed bent as shown in the drawings; but when the fire-box is constructed square the pieces a and b are constructed straight. The end pieces n and b are so constructed that the channels therein for the conveyance of water have a much larger diameter than those in the grate-bars and water-conductors e. I find from experience that it is necessary to so construct the end pieces n and b in order to cause the water to circulate freely through the grate-bars and water-conductors in the {ire-box. Each end of the piece b is closed. One end ofthe piece n is closed and the other is open and threaded and screws into the pipe m. E is a pipe leading from the end piece ZJ upward into the boiler through the bottom thereof.

Bisadouble-acting force-pump of ordinary construction.

dis a tube, the inner open end of which en ters the boiler, the outer. end of 4which is closed.

fand g are tubes leading from the tube d into the chamber of the force-pump B.

h and t are tubes leading from the chamber of the force-pump into the tube or chamber c, the tube or chamber c being closed atreach end.

m is a tube leading from'the'tube or chamber c into the front hollow end piece n of the grate.

Any desired form of force-pump may be IOO vthereto by steam-power.

employed, which is so constructed and arranged thaty it will y draw the water from the boiler and force it through the grate and water-conductors connected thereto and back into the boiler. The pump may be operated by hand or with suitable machinery connected operated, it draws the Water from the boiler and forces it through the grate and waterconductors connected thereto into the boiler,

thereby causing, during the time the pump is operated, a continuous circulation of water through the grate, water -conductors, and boiler. l/Vhen a tire is kept in the furnace,

the grate and Water-conductors in the {ire-box become very hot, therebyA imparting much heat .to the water as it circulates through them. By reason of the fact that the water from the boiler vis kept circulating through the hot girate P and the hot-water conductors a the heating of the water in the boiler .is greatly facilitated Vand steam is quiclgl y, readily, and economically generated.

Having thus vdescribed my invention, what I claim as new, and desire to secure by Letters Patent, is-

l. In steam-generating apparatus, the

combination'with a boiler, of a hollow grate,

water-Conductors .Connected t0 the grate and loeatcd in the tire-box between the grate and y' lVhen the pump is top of, ,fire-box 'and adapted ,to be llllfouded by thegfuel y.in the firefhox, t-ube leading from the grate into the boiler, and a forcepump adapted to draw the water from the boiler and force it through the grate and Water-conductors back into the boiler, substantially as described.

2. A hollow grate for a steam-generating apparatus having waterfconductors connected thereto and located within the fire-box between the grate and top of the fire-box and adapted to be surrounded by the fuel in the tire-box, substantially as described.

3. In a steam-generating apparatus, the combination with a boiler, of a hollow grate, water-conductors .connected to the grate and loated in the rerliox between .the grate and top `of the fire-box and adapted to he surrounded by the fuel in the fircf'box, Yand means for` causing the water to circulate through the boiler, grate, and Water-con ductors, substantially as described.

Signed by me at the city of Atlantic, in the county of Cass and State of Iowa, nthis l-'Lth day of October, A. D. 1898.

EDWARD L. RIGG.

Vitnesses;

HAMILTON WILooX, A. G. ARRAsMrrH. 

